Tree falling

Found a good location where a beaver is wearing its teeth down.  I don't believe they are trying to fall the trees but just wear their teeth down , if they grow too long they can become unable to open their mouth far enough to eat.  Fir trees are not their main diet, they mainly like cottonwood and eat lots of small bushes, grass and roots.

I aimed the camera at this tree because it was the most recent one that had been chewed on.